ALIEN RAIN Pro Silver SystemPlease note: this system now comes with a Brennenstuhl timer instead of the brain unit + the system is purchased to order, so extended lead times will apply. ALIEN RAIN Pro Silver System Mimic rain wet media evenly with an ALIEN RAIN System. Nutrient solution is showered down directly over the top of all your media, wetting evenly and flushing out salt residue. Your media is wet and dries evenly, so roots utilise all your media and have better access